I could take a picture but its easy to find once you know where it is. If you look where your cord plugs into the machine there is a picture of a fuse right below the plug. It's sort of a little plastic holder ... its kind of hard to get out of the machine...nothing really to grab hold of.

Disregard. I found it. The writing is tiny (I am using a magnifying glass) but I think it says F15AL, 250v. So, I would say if the machine attempts to draw > 15 amps, the fuse will blow. If you were given a 6 or 10 amp fuse, I assume that is the problem.

From what I have been reading, the voltage rating on fuses is the maximum input voltage at which the fuse can safely protect the appliance at the rated amperage, so a 250v is still appropriate for 110v usage.

yes nothing had to be taken apart to get to the fuse.... also a 250V can be used in our setups at 110.... however a normal 125V can't be used in a 230V system. 15A seems high from what I have figured, but 15 is exactly what they sell as replacements at 1st-Line..... if my 10A works I will probably just leave it. Thats something.... all this time my problem must have been the wrong size fuse. I have to sit back and wait to see if this one keeps working or not.... no way to guess when it might blow.

I've still been struggling with making microfoam with the Cuadra 2's steam tip. I never had this much trouble with my last machine which had only one small hole. So . . . I finally decided to try and plug one of the 2 holes on the Cuadra with a toothpick. SUCCESS! I am finally able to make microfoam easily and perfectly every time.

I'd rather not use a tip with a piece of toothpick sticking out of it (it's difficult to keep it clean).

Does anyone know of a 1 hole tip that will fit the Cuadra 2's no burn steam arm?

It sounds to me like you have the wrong fuse. A 6A fuse is going to be worthless for a 1400W machine running at 120ish volts. At 110 volts it would be drawing around 12.7A, and at 130 V it will be drawing around 10.8A.

Voltage spikes on your line won't wont be causing this issue, particularly in the minimal range that you have described. You said that it spikes when the pump kick in...this is normal. Of course, for the < 1 second after the pump engages, there will be a current spike. There are probably coils in the heating element which also give rise to some odd electrical behavior...I'll spare you this explanation. Again, though, all of this would have been considered when the circuitry was designed, so won't be an issue.

So, from what I've read, i'd say that your issue is with a fuse that is rated for too low of a current, or there is some short in the system, somewhere. I doubt very much that your house wiring is an issue, and doubt more-so that the power supplied to your house is an issue. If the fuse are rated for 250V as slybarman indicated, you're fine in that regard.

I'm an electrical engineering student (junior) and used to be an electrician, so have some experience in this area (there is an awful lot that I don't know, though, lol) so if I can answer specific questions, please let me know and I'll try and help as best I can.

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